Muscle Mass Percentage Calculator

Understanding your muscle mass percentage helps you assess your fitness level and track strength training progress. Skeletal muscle mass - the muscles you can voluntarily control for movement - typically comprises 30-45% of body weight in healthy adults, varying by sex, age, and training status. This calculator estimates your muscle mass percentage based on your body fat percentage, as muscle is the primary component of lean body mass aside from organs and bones. Higher muscle mass percentage is associated with better metabolic health, higher calorie burn at rest, improved insulin sensitivity, stronger bones, and reduced risk of age-related muscle loss (sarcopenia). Athletes and strength trainers typically have higher percentages than sedentary individuals. Note that this calculator provides estimates - precise muscle mass measurement requires advanced imaging like DEXA scans or MRI.